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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.commons.converter;
import java.sql.Timestamp;
import java.text.DateFormat;
import org.databene.commons.ConversionException;
import org.databene.commons.Patterns;
import org.databene.commons.StringUtil;
import org.databene.commons.format.ConcurrentDateFormat;
import org.databene.commons.format.ConcurrentDecimalFormat;
/**
* Formats a {@link Timestamp} as {@link String}.
* Created: 18.02.2010 17:46:14
* @since 0.5.0
* @author Volker Bergmann
*/
public class TimestampFormatter extends ThreadSafeConverter {
private DateFormat prefixFormat;
private ConcurrentDecimalFormat postfixFormat;
private long nanoDivisor;
// constructors ----------------------------------------------------------------------------------------------------
public TimestampFormatter() {
this(Patterns.DEFAULT_TIMESTAMP_PATTERN);
}
public TimestampFormatter(String pattern) {
super(Timestamp.class, String.class);
// calculate the number of postfix digits
int lastPos = pattern.length() - 1;
int sepPos = lastPos;
while (pattern.charAt(sepPos) == 'S')
sepPos--;
// define prefix and postfix patterns
String prefixPattern;
prefixPattern = (sepPos < lastPos ? pattern.substring(0, sepPos) : pattern);
this.prefixFormat = new ConcurrentDateFormat(prefixPattern);
int postfixDigits = lastPos - sepPos;
if (postfixDigits > 0) {
String postfixPattern = new String(StringUtil.fill(new char[postfixDigits], 0, postfixDigits, '0'));
this.postfixFormat = new ConcurrentDecimalFormat(postfixPattern);
this.nanoDivisor = (long) Math.pow(10, Math.round(9. - postfixDigits));
} else
this.postfixFormat = null;
}
// Converter interface implementation ------------------------------------------------------------------------------
@Override
public String convert(Timestamp sourceValue) throws ConversionException {
return format(sourceValue);
}
// static convenience method ---------------------------------------------------------------------------------------
public String format(Timestamp timestamp) {
if (timestamp == null)
return null;
String result = prefixFormat.format(timestamp);
if (postfixFormat != null) {
long postfixDigits = timestamp.getNanos() / nanoDivisor;
result += '.' + postfixFormat.format(postfixDigits);
}
return result;
}
}